All rankings
Maryland · Maryland (MDE)
Mattawoman WWTP
Permit N/A
—
No waterway impact reported
Reported events
44
Total volume
58.1M gal
Reached waterways
0 (0%)
Reporting since
2006
What caused the overflows
Rainfall / Flooding
16
Other / Unknown
13
Equipment Failure
12
Grease / FOG
3
Reported overflow events (showing 44 of 44)
| Date | Volume | Cause | Reached water | Receiving water |
|---|---|---|---|---|
| Aug 20, 2024 | 50 gal | Other / Unknown | — | N/A |
| Aug 20, 2024 | 50 gal | Other / Unknown | — | N/A |
| May 15, 2024 | 2.6M gal | Other / Unknown | — | Stormwater management pond, to an unnamed tributary to Zekiah Swamp Run |
| Mar 6, 2024 | 3.8M gal | Other / Unknown | — | Potomac River |
| Dec 11, 2023 | 51.6M gal | Other / Unknown | — | Potomac River |
| Dec 11, 2023 | — | Other / Unknown | — | Potomac River |
| Jul 30, 2023 | 60K gal | Other / Unknown | — | Mattawoman Creek via groundwater |
| May 25, 2022 | — | Equipment Failure | — | — |
| May 18, 2022 | — | Equipment Failure | — | — |
| May 11, 2022 | — | Equipment Failure | — | — |
| Apr 6, 2022 | — | Rainfall / Flooding | — | — |
| Mar 22, 2022 | — | Grease / FOG | — | — |
| Feb 15, 2022 | — | Grease / FOG | — | — |
| Feb 4, 2022 | — | Rainfall / Flooding | — | — |
| Jan 3, 2022 | — | Equipment Failure | — | — |
| Apr 28, 2021 | — | Equipment Failure | — | — |
| Feb 28, 2021 | — | Rainfall / Flooding | — | — |
| Jan 2, 2021 | — | Rainfall / Flooding | — | — |
| Dec 17, 2020 | — | Rainfall / Flooding | — | — |
| Oct 29, 2020 | — | Rainfall / Flooding | — | — |
| Aug 29, 2020 | — | Rainfall / Flooding | — | — |
| Aug 4, 2020 | — | Rainfall / Flooding | — | — |
| Mar 16, 2020 | — | Other / Unknown | — | — |
| Jan 9, 2019 | — | Other / Unknown | — | — |
| Jan 8, 2019 | — | Other / Unknown | — | — |
| Oct 14, 2018 | — | Other / Unknown | — | — |
| Oct 12, 2018 | — | Rainfall / Flooding | — | — |
| Oct 12, 2018 | — | Rainfall / Flooding | — | — |
| Sep 24, 2018 | — | Rainfall / Flooding | — | — |
| Jul 22, 2018 | — | Rainfall / Flooding | — | — |
| Feb 10, 2018 | — | Rainfall / Flooding | — | — |
| Dec 4, 2012 | — | Equipment Failure | — | — |
| Oct 30, 2012 | — | Rainfall / Flooding | — | — |
| Aug 27, 2011 | — | Rainfall / Flooding | — | — |
| Feb 15, 2011 | — | Equipment Failure | — | — |
| Mar 29, 2010 | — | Equipment Failure | — | — |
| Dec 26, 2009 | — | Other / Unknown | — | — |
| Nov 16, 2009 | — | Equipment Failure | — | — |
| Oct 21, 2008 | — | Equipment Failure | — | — |
| May 12, 2008 | — | Rainfall / Flooding | — | — |
| Apr 16, 2007 | — | Equipment Failure | — | — |
| Nov 15, 2006 | — | Grease / FOG | — | — |
| Sep 11, 2006 | — | Other / Unknown | — | — |
| Jun 6, 2006 | — | Equipment Failure | — | — |
Source: Maryland (MDE). Volumes are utility-reported estimates. Some events lack precise coordinates or volumes.